Tribonium conspersum (Guérin-Méneville & Percheron, 1835)

(Figs.11–20, 32, 35)

Examined material. Argentina: 1♂, Misiones Province, Puerto Rico, (-26,810.511; -55,022.281), 25/IX/2009, L. Villarquide Col. (ANLIS); Jujuy Province, 1♂ 1♀, La Isla (-23,537.206 -65,377.306) I/1948 col. Willink A. and Monrós F. (IMLA); Tucumán Province, 1♂, Burruyacu Río Nío (-26,439.833; -64,987.317) 19/XII/1981 col. Golbach R. (IMLA), 1♂ Raco (-26,676.569; -65,412.711) 01-I-1974 col. Stange L, 1♂ 3♀, Choromoro (- 26,4407.961; -65,315.994) II/1958 col. Wygodzinsky P. (IMLA).

Measurements (mm). Male from Misiones: TL: 28,3. BL: 27.5. BW: 14.9. PL: 5.3. PW: 10.7. TeL: 23,0. TeW: 7.9. IO: 1.6. IA: 2.2. IOc: 1,5. Males from Tucumán and Jujuy: TL: 24.0–21.8. BL: 22.2–18.2. BW: 11.1–9.9. PL: 4.9–4.2. PW: 8.8–7.7. TeL: 20.3–17.9. TeW: 6.7–6.0. IO: 1.6–1.4. IA: 2.1–1.7. IOc: 1.3–1.1. Females from Tucumán and Jujuy: TL: 23.7–21.3. BL: 24.5–21.8. BW: 11.5–9.4. PL: 4.6–4.2. PW: 8.4–7.5. TeL: 19.5–18.0. TeW: 6.7–5.8. IO: 1.6–1.5. IA: 1.9–1.8. IOc: 1.3–1.2.

Redescription. Large size for the genus; body wide and flattened; pronotum with a light black spot; tegmina covering the abdomen, shorter and broader than those of T. rothi (Figs. 11–13).

Thorax. Prothoracic femora D0 type, ventral posterior margins unarmed and genicular spine absent. The same spine distribution is observed on meso- and metathoracic femora. Tibial formula: Males [7–6*3–2*3–2] [11–9*4–2*5–2] [13–12*3*8–6] Females [7–6*2*3–2] [10*3–2*4–3] [13–12*3–2*7–6]. Tarsi with large arolia.

Abdomen. Supra-anal plate sub-quadrangular, posterior border bilobated with a strong median incision (Fig. 14). Paraprocts sclerified (Fig. 15), right paraproct with a curved apophysis directed upward and forward. Subgenital plate asymmetrical, with long setose styli (Fig. 16).

Male genitalia similar to T. rothi but differing as follows: Sclerite L2’ (Fig. 18) has a well-developed spoon shaped posterior apophysis, as Grandcolas (1993) previously observed for T. spectrum, where the same extends dorsally. The cranial margin of via is concave (swellings absent), and exhibits an arched dorsal process that leans on the surface of the apophysis. The process via of L2’ presents a cranial blunt and an acute caudal projections on the opposite side of the dorsal process (Fig. 19). L3’ exhibits a wide, subconical base that abruptly becomes necklike. The internal ventral margin of the hook apex is smoothly convex and its external curvature is almost regular (Figs. 17, 35). The right phallomere is a complex structure formed by 4 sclerites (Figs. 20, 33). The principal plates exhibit a cleft with wide and very sclerotized arms (R2’ and R1T’) with similar curvatures (Fig. 20 a). R3’ resembles a triactinate spicule (Fig. 20 b) with its laterocranial apex distally sharpened. The cpR1T’ bears a slightly evident tooth.

Distribution. T. conspersum has been registered only from Brazil and Bolivia (Princis 1964). New geographical records include Jujuy, Misiones and Tucumán provinces, all in Argentina.